参考作物腾发量计算方法的适用性研究  

Adaptability Research of Different Reference Crop Evapotranspiration Estimated Methods in Shaanxi

作　　者：廖显琴[1] 李毅[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《灌溉排水学报》2009年第6期14-17,71,共5页Journal of Irrigation and Drainage

基　　金：西北农林科技大学2006"青年学术骨干支持计划";国家自然科学基金项目(50709028)

摘　　要：选用5种方法,利用陕西6站的气象资料,计算了各站逐日ET0。并以FAO56 Penman-Monteith(P-M)法为标准,对其它方法进行评价。结果表明,在陕西6地区,5种方法计算的ET0变化趋势基本相同,但数值上有一定差异,所有的差异随ET0的增大而增大。Hargreaves法计算结果差异性较小,适用性较好;1948Penman和Priestley-Taylor二方法估值较FAO24 Penman法更接近P-M法的计算结果;缺气象资料时,Priestley-Taylor法可获得较好估值,且更适用于湿润地区;FAO24 Penman法也能获得较好结果,但其估值精度低于Priestley-Taylor法,一般不宜采用。同时分析了P-M法计算的ET0值和水面蒸发量之间的关系,为利用水面蒸发资料估算陕西6地区ET0值提供参考。It is the foundation of crop water requirement and production management to make the accurate estimation of reference crop evapotranspiration（ET0） for every region,particularly,it is very important for agricultural water-saving irrigation planning.The daily ET0 was computed by five methods with the meteorological data from six weather stations of Shaanxi.As FAO56 Penman-Monteith（P-M） method is taken as the standard,the comparison is taken and the results are as follows.The variation trend of ET0 calculated by five methods is roughly the same for six stations in Shaanxi,but the value are different,and all differences increase along with the increase of ET0.The difference of the results computed by Hargreaves method is so small,and it is adaptable for every region.1948Penman and Priestley-Taylor are better methods for every climatic area than FAO24 Penman.If climatic data are insufficient,Priestley-Taylor method for any region may provide reliable ET0 estimation.A better result also can been obtained by FAO24 Penman method,but the precision of its estimated results is lower than Priestley-Taylor method,and it is not used generally.Meanwhile the relationship between the ET value computed by P-M method and evaporation is analyzed and that can provide a reference for estimating ET0 using evaporation data for six stations in Shaanxi region.

关 键 词：参考作物腾发量 FAO56Penman-Monteith方法 适用性 水面蒸发量 

分 类 号：S274[农业科学—农业水土工程]